Nokia 7210 Configuration Manual page 272

System Management
Logical Model of Synchronization Reference Selection on 7210 SAS
Figure 24
ref1
SyncE
ref2
1588
ptp
T1/E1 BITSin
T1/E1 BITSin
When the CES MDA is used on the 7210 SAS-M (all variants), in addition to the
preceding references, the recovered clock derives the timing from either of the
following references:
On the 7210 SAS-Mxp, 7210 SAS-R6, 7210 SAS-R12, and 7210 SAS-T, in addition
to PTP and SyncE references, the recovered clock can be configured to derive the
timing (frequency reference) from the BITS interface.
When quality Level (QL) selection mode is disabled, the reversion setting controls
when the central clock can reselect a previously failed reference.
Table 30
revertive modes.
272
Quality Level Override
Qualifier
Qualifier
Qualifier
Qualifier
Qualifier
• T1/E1 CES channel (not available for node reference)
• T1/E1 port (for loop-timing; not available for node reference)
lists the selection followed for two references in both revertive and non-
Use subject to Terms available at: www.nokia.com
7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Quality
Reference
Level (QL)
Selector
Quality
Level (QL)
Mode 1) Priority
reference order
Mode 2) QL then
Quality
priority reference
Level (QL)
order
Quality
Level (QL)
Quality
Level (QL)
Digital Phase
Locked Loop
(DPLL)
© 2021 Nokia.
Configuration Guide
BITSout
BITS
T1/E1
Output
2048 kHz
Selector
Internal
(Node)
Timing
Reference
26997
3HE 17358 AAAB TQZZA